工字规热处理过程的变形分析及工艺改进
Deformation Analysis and Process Improvement of I-shape Gauge during Heat Treatment
辛学松 1徐雁波 1郑喜平 2马长喜 1元杭1
作者信息
- 1. 商丘工学院 机械工程学院,河南 商丘 476000
- 2. 郑州精益达汽车零部件有限公司 底盘事业部,河南 郑州 450000
- 折叠
摘要
20 钢工字规在淬火过程中,其长度方向发生强烈收缩.结果表明:引起收缩的主要原因是在高温冷却过程中,表面的高碳马氏体向心部压缩,心部塑性良好的铁素体组织受到挤压,长度缩短,呈现了明显的热应力特征.经过降低淬火温度,采用变形小的硝盐作为淬火介质对工艺进行优化,采用优化工艺后的工字规硬度为 61 HRC,收缩量为0.24 mm,挠曲变形量为 0.05 mm;表面渗碳层的金相组织为隐针状马氏体,心部为板条状马氏体,均符合技术要求.
Abstract
During quenching,the length direction of 20 steel I-shape gauge shrinks strongly.The results show that the main reason for shrinkage is that during high temperature cooling,the high carbon martensite on the surface is compressed to the center,and the ferrite with good plasticity in the center is extruded,the length is shortened,showing obvious thermal stress characteristics.After reducing the quenching temperature and using the nitrate with small deformation as the quenching medium,the process is optimized.After the optimized process,the I-gauge hardness is 61 HRC,the shrinkage is 0.24 mm and the flexural deformation is 0.05 mm.The metallographic structure of the carburized layer on the surface is cryptoacicular martensite and the center is lath martensite,which can meet the technical requirements.
关键词
20钢/工字规/硝盐冷却/变形量/热应力变形Key words
20 steel/I-shape gauge/nitrate cooling/deformation/thermal stress deformation引用本文复制引用
基金项目
河南省科技攻关项目(142102210267)
出版年
2024
NETL
NSTL
万方数据